问题
问答题
测定生活饮用水中硝酸盐氮的标准检验方法主要有哪些？
答案
参考答案：
麝香草酚分光光度法，紫外分光光度法，离子色谱法，镉柱还原法
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测定生活饮用水中硝酸盐氮的标准检验方法主要有哪些？
参考答案：
麝香草酚分光光度法，紫外分光光度法，离子色谱法，镉柱还原法
A true friend is always helpful. I didn’t believe it one thing happened to me when I was in Grade 7. Li Jie was one of my classmates. He and I were also neighbours. He always listened to his mother I didn’t like listening to my mother. I didn’t think it was necessary for to teach me anything. Li Jie knew all about that but he said to me. One weekend, Li Jie invited me to watch a film. I liked films very much so I went to the with him happily. The film was about the love between a and her son. After watching it, I began to know how great the love of the mother was. I felt that I didn’t listen to my mother before. I decided to think more about my mother than about . After I told that to him, Li Jie smiled and said, “It’s really necessary for you to watch such a film. That was a good choice (选择) for both you and me.” Suddenly, I knew he invited me to watch the film. Just at that time, I knew a true friend is always .
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